The tauromachia arena (Spanish plaza de toros), also known as taurine circus or piazza dei torri, originates in ancient Europe. It is an architectural structure with classical arsenal-like functionality though of a different style depending on the major or minor antiquity of the building. It is mainly an amphitheater closed by the approximately circular shape with steps and services that surround a central space where the Taurine show is realized. In this space there is the well-known ruedo or arena, which is a dirt ground prepared to serve properly to the show and is surrounded by a retreat where riflemen and their subalterns are called alleyways. The alley is separated from the arena by a wall, generally of wood and about 140 inches tall, which has small entrances to the arena to facilitate entry into an emergency. It has doors for entry and exit of participants and bulls, although the amount and layout of these varies from fence to fence. The development of fences with specific features for bull bulls production is related to the development of the show as such. In ancient times, Roman circuses had characteristics similar to those of today's arenas for tauromachia (in fact, the Nimes arena, in France, is a Roman amphitheater), and the origins of bullfights are related to ancient Roman traditions. principle were not very useful for these events. When the taurine feasts were mostly made on horseback, the shows were public and were realized in the squares of the cities. Only later, with the emergence of the spectacle with the torero standing as the most representative expression of the tauromachia, during the rise of great local torrents and in the face of the reigning disorder during these festivals, the creation of spaces that hosted the public. In fact, before being authorized in 1730 to construct the plaza de toros of Real Maestranza de Caballeria de Sevilla to make bullfights, the original space had a rectangular shape, and the construction of circular spaces did not begin until three years later. Another circular arena began to be built in Ronda in 1754, where the first performances were made in 1782. In Spain the Royal Decree no. 145/1996 organizes these arenas in three categories. According to age, tradition, size and number of annual festivals, the arenas are divided into first, second and third category. They are of the first category those of Bilbao, San Sebastian, Zaragoza, Barcelona, Madrid, Valencia, Córdoba, Sevilla and Málaga. Decree 145/1996 imposes a minimum weight of bulls, and other details depending on the category to which the arena belongs. Autonomous communities can add new provisions to the category. For example, in Andalusia, any citizen can be chosen as president with the right to grab the bull in third-rate arenas. The category also serves as the discriminatory for the entry price, the insurance and the professionals that must be present during the act.